Coffee mug



FIG. 1 is a top front isometric view of a coffee mug showing my new design;

FIG. 2 is a bottom rear isometric view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is a left side elevation view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

The features shown in broken lines in the drawing depict portions of the design that form no part of the claimed design. The dash-dot-dash lines in the drawings represent the bounds of the claim and form no part of the claimed design. 

CLAIM The ornamental design for a coffee mug, as shown and described. 